No honesty on reinstallation and settlement fees

So here I am with Netstar again, called them in January when I bought a new car and explained that I have a tracking unit on the car that I was trading in. They explained that to recover that unit and to instal the new unit on my vehicle will cost the same amount which they chose to install the new unit on the new car. Three months later they sent me SMS that my account is not paid, I call their centre and they tell me I didn't cancel the unit on the other car. Why would they instal the new unit if I was keeping the other one? And now I'm charged settlement fee for what?

Everytime different stories from their consultants, in January I was told I'm reliable for re-installation, today I'm told I must pay early cancellation (settlement fee). I am looking for a better provider I'm coming back to cancel your unit on my Ranger